Shimano RX 100 (A551) exploded view - #1390 July 1993
Vintage Shimano - RX100 rear derailleur on the vintage Shimano service bench. These are basically identical to 105 1055 apart from the polished finish. | Facebook
Shimano RX100 RD-A551 Rear Derailleur Japan – PioraBikes
Shimano RX100 RD-A550 7 Speed Short Cage Rear Derailleur Vintage NOS BMX | eBay
Shimano RX100 #A550 7-speed Group Set from 1992 – Velosaloon.com
Rear derailleur Shimano RX100 RD A550 in second hand condition
shimano rx100 groupset | a new recyclist
New-Old-Stock Shimano RX100 (Second Generation) Front Derailleur...28.6 mm Clamp | eBay